HP Deskpro 300 Compaq Deskpro Workstation 300 Hardware Reference Guide - Page 49

It may be necessary to remove an expansion card to gain, access to the battery., Battery Replacement

Page 49 highlights

To replace the battery: 1. Shut down the operating system properly, turn off the computer and any external devices, disconnect the power cord from the electrical outlet, and remove the computer cover or access panel. ✎ It may be necessary to remove an expansion card to gain access to the battery. 2. Locate the battery and battery holder on the system board, as shown in the following illustration. Battery and Battery Holder C-2 Battery Replacement

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C-2
Battery Replacement
Compaq Confidential - Need to Know Required
To replace the battery:
1.
Shut down the operating system properly, turn off the computer
and any external devices, disconnect the power cord from the
electrical outlet, and remove the computer cover or access panel.
It may be necessary to remove an expansion card to gain
access to the battery.
2.
Locate the battery and battery holder on the system board, as
shown in the following illustration.
Battery and Battery Holder